וְאוּלָ֗ם בַּעֲב֥וּר זֹאת֙ הֶעֱמַדְתִּ֔יךָ בַּעֲב֖וּר הַרְאֹתְךָ֣ אֶת־כֹּחִ֑י וּלְמַ֛עַן סַפֵּ֥ר שְׁמִ֖י בְּכָל־הָאָֽרֶץ׃
내가 너를 세웠음은 나의 능력을 네게 보이고 내 이름이 온 천하에 전파되게 하려 하였음이니라
Chizkuni
ולמען ספר את שמי בכל הארץ, “and in order to spread My fame in the whole country, (or on the whole earth).” G-d continues to respond “tit for tat,” seeing that Pharaoh had denied His existence, not to acknowledge His power, G-d will make sure that he will see how wrong he had been, and he would have to do so publicly.
Rashbam
NEVERTHELESS I HAVE SPARED YOU FOR THIS PURPOSE: IN ORDER TO SHOW YOU MY POWER, ETC. To inform you of your foolishness, in your saying (5:2), "I do not know Adonai.
Sforno
בעבור הראותך את כחי, so that you may finally display repentance. In the final analysis, I am not interested in the death of the sinner but in his rehabilitation through his own efforts. (Ezekiel 18,31)